Detection of Fiber Direction in Composites by Means of a High-Frequency Wide-Bounded Ultrasonic Beam and Schlieren Photography
| Autor: | Joris Degrieck, A. Teklu, M. A. Breazeale, Roger D. Hasse, Oswald Leroy, Nico F. Declercq |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Ultrasonic beam business.industry Mechanical Engineering Ultrasound Synthetic schlieren Classification of discontinuities Condensed Matter Physics Optics Mechanics of Materials Bounded function General Materials Science Fiber Reflection coefficient Composite material business Schlieren photography |
| Zdroj: | Research in Nondestructive Evaluation. 16:55-64 |
| ISSN: | 1432-2110 0934-9847 |
| DOI: | 10.1080/09349840591003212 |
| Popis: | This work describes an experimental method, based on the combination of schlieren photography and a 2.5-cm-wide-bounded ultrasonic beam of 10 MHz, used to detect the fiber direction in composites. Experiments are described on unidirectional and fabric fiber-reinforced composites. The method exploits the spatially dependent reflection coefficient because of discontinuities in the fiber density. The typical discontinuities that reflect the fiber direction are detectable if 10-MHz ultrasound is applied. Lower frequencies are not susceptible to these typical discontinuities, whereas larger frequencies would make the use of schlieren photography more difficult. |
| Databáze: | OpenAIRE |
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